Pneumatic riveter.



Patented Sept. 4, I900. H. H. PRANGE. PNEUMATIC RIVETER.

[Application filed Feb. 19, IDOQ.)

(No Model.)

ma ncnms PETERS 110.. mau'rmuTMownsnmm'rm. u. c.

UNITED STATES 1 PATENT OFFICE.

HERMAN H PRANGE, AKRON, OHIO, ASSIGN OR TO THE JOHNSON, PARFITT TOOL COMPANY, OFsPRINGFlELD, ILLINOIS.

PNEUMATIC RIVETER.

SPECIFICATION forming part of Letter s Patent No. 657,449, dated September 4, 190i). Application filed February 19, 1900. Serial No. 5 ,774. (N0 model.)

To all whom it may concern.-

Be it known that I, HERMAN H. PRANGE, a citizen of the United States,residing at Akron,

in the county of Summit-,State of Ohio, have invented certain newand useful Improve ments in Pneumatic Riveters; and I hereby declare the following to be a full, clear, and exact description of the same, such as will enable others to make and use myinvention.

In the drawing forming a part of this specification and illustrating myinvention is shown a suitable yoke or support, parts being broken away, and sectional views of a pneumatic hammer and a pneumatic hold-on supported by or attached to the opposite arms of the yoke.

Like symbols refer to like parts wherever they occur.

The object of myinvention is to so combine a plate-closer with a pneumatic riveter as to obtain a constant length of stroke of the riveting-hammer, whereby closer joints and more uniformrivets are obtained as a result of the operation of the machine.

To this end myinvention, generally stated, embraces the combination, in a riveting-machine, of a fixed hammer-casing, and a pneumatic-hammer cylinder longitudinally movable in said fixed casing, the fixed casing having a plate-closer which projects beyond the working or advanced position of the longitudinally movable hammer cylinder, whereby the hammer-cylinder is "allowed a gradual advance, and the length of the stroke of the riveting-hammer remains constant,

I will now proceed to describe myinvention more fully, making reference to thedrawing for that purpose.

In the drawing, A indicates a yoke or other suitable support, to one arm of'which is secured a pneumatic hold-on B and to the other and in line with the hold-on a pneumatic riveter or hammer G. The pneumatic hold-on may consist of the usual cylinderb, provided with a piston or ram 1), in the outerend of which is secured the snap or die 12?, which constitutes the anvil and is shaped to receive the head of the rivet and support the rivet and plates under the blows of the rivetinghammer. The ram-cylinder ,b is provided with an induction-port and supply-pipe and with a suitable throttle-valve 79 F indicates the supply-pipe of the motive fluid provided with a suitable throttle-valve F and divided into branches F and F leading, respectively,,to the hold-on B and the hammer 0, each of said branches having its own throttle-valve b and o.

0 indicates the fixed outer casing for the support of the pneumatic-hammer cylinder d, which is longitudinally movable therein, said casing 0 closed at one end by a cap or closure 0 and at the other or open end eX- tended, preferably by a detachable sleeve, beyond the normal travel of. the hammercylinder, as at 0 to constitute a plate-closer, whichmay be slotted, as at 0 to per permit of the operator inspecting the work during the operation of the machine. This outer fixed cylinder-c is provided with an induction-port c and inlet or pressure pipe 0 provided with a suitable throttle-valve c for controlling the admission of the motive fiuid to the hammer-cylinder.

61 indicates the hammer-cylinder, longitudinally movable in the outer or fixed casing c, said hammer-cylinder d being reduced in diameter to form an annular shoulder d and chamber (1 for the reception of the motive fluid, the annular chamber 01? having communication with the chamber a of easing 0, so thatv the motive fluid shall exert its pressure on the end of the hammer-cylinder d to hold it up to the work and cause its gradual advance as the rivet is formed. The rear end of the hammer-cylinder d is closed by a cap 01 and, if desired, a retracting-spring 8 may be interposed between the outer or fixed casing and the hammer-cylinder to retract the hammer-cylinder when the fluid-pressure is removed. The forward endof the hammercylinder is provided with a central bore for the reception of the riveting-die R, which is movable therein and is struck by the piston or hammer D. The hammer-cylinder d is provided with ports d whereby the hammercylinder communicates with the surrounding pressure-chamber 01 while in the forward d part of the hammer-cylinder is the annular exhaust-chamber df, provided with exhaustports'clh D indicates the piston (or hammer) of the hammer cylinder, provided on its exterior with an annular shoulder (i and havinga central passage E, from which extend the ports or passages e e, which are alternately inlet and exhaust ports, according to the position of the piston or hammer D.

The construction of the devices being substantially of the character hereinbefore set forth, their operation will be as follows:

properly-heated ri'vet liaivihg been inserted: in the rivet-holes of the plates to be united, said .plates are placed againstthe plate-closer with the rivet projecting into the plate-' closer in line with the riveting-die R, the hammer-cylinder d being at such time withdrawn or at the extent of itsbackward move- 'ment. The throttle-valves F and I)? are then openedand the motive fluid is admitted to the cylinderbof hold-on B, which projects the ram 1) and forces the die 1) against thet 'head'of the rivet, thus holding the plates to be riveted in. firm contact with the plate-'5 fcloser c on theend of fixed .casing c of the;

hammer-cylinder. When this has been done, 5

the operator turns the throttle-valve c to admit the motive fluid to the fixed casing and? The motive fluid passes hammer-cylinder.

through induction-port c first into the an-" "nular chamber d surrounding the hammercylinder 01, and forces said hammer-cylinder bears upon the rivet, after which the motive fluid passes by theports d into the hammercylinder forwardof the annular shoulder (15 passages e a into the interior E of the piston orhammer D, whereupon the hammer is 1 projected forward and delivers its blow on j riveting die or header R. The forward movement of the piston or hammer D closes ports e e'as to the induction-ports d of the "1 (1 (1 and the forwardstroke of the hammer hammer-cylinder and opens them as tothe exhaustchamber d and exhaust-ports d,

whereupon thepiston or hammer D is withdrawn (or given its reverse movement) by f the pressure of the motive fluid fromports d on the annular shoulder d of the piston or.

hammer. When the piston or hammer D has reached substantially the limit of its inward movement, the ports or passages? e are again brought in register with the induction-ports follows, as hereinbefore pointed out; The

stave-sored: operation thehammer continuesnnti'l such time a's'tlie motive, fluid is cut OE, and the continued pressure of the motive fluid in the annular chamber 01 and the hold-on and hammer" one operator is enahled tofirst advance the hold-on and subsequently advance the hammer and control its operation, and it will also be noted that by combiningaplate closer with a fixed casing and a hammer longitudinally movable in the casing the travel and force of blowof the hammercan be rendered constant and uniform and not variable', as in previous constructions.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is r 1. The combination with a suitable supand forthe purposes specified. forward until the riveting-die (or h'eader)R A porting-casing, of a pneumatic hammer longitudinally movable in the casing, means for the admission of motive fluid to the casing and hammer, a plate-closer mounted on the casing, and means for holding the rivet and plates up to the plate-closer, substantially as hammer longitudinally movable in the. fixed casing, means for the admission of motive fluid to the hold-on and to the fixedicasing and the pneumatic hammer, and a plate-closer mounted on the fixed casing, substantially as and for the purposes specified. p

p .3. The combination with a-suitable support, of ahold-on, a casing, a pneumatic hammer longitudinally movable in the casing, and a valved motive -'fluid-supply pipe having branches leading to the hold-on and to thecasing the one leading to the casing having an independent throttle-valve, substantially as and for the purposes specified.

'In testimony whereof I affix my signature, in presence of two witnesses, this13thday of February, 1900.

HERMAN H. PRANGE.

. Witnesses CARRIE M. KQLP,

R; M. WANAMAKER. 

